Q: which is the bank 1 for the O2 sensor? on 2004 Hyundai Sonata

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OBD codes 421
(2) Answers
(1) Comments
On my car- there are two sensors and both are on the manifold. One is on the top of the manifold, the other is on the bottom of the manifold. Which is bank 1 sensor- since I only have one exhaust.